⚛️ Category

quant-ph

8820 papers

Quantum physics explores the strange and often counterintuitive rules that govern the universe at its smallest scales. This field investigates how particles like electrons and photons behave in ways that defy our everyday intuition, forming the backbone of modern technologies from lasers to future quantum computers. While the mathematics can be daunting, the core ideas promise to revolutionize how we understand reality and process information.

At Gist.Science, we make these complex discoveries accessible to everyone. We systematically process every new preprint published in the Quant-Ph category on arXiv, transforming dense academic papers into clear, plain-language explanations alongside detailed technical summaries. Whether you are a seasoned researcher or a curious reader, our goal is to bridge the gap between cutting-edge theory and human understanding.

Below are the latest papers in quantum physics, distilled to help you grasp the newest breakthroughs without getting lost in the jargon.

⚛️ quantum physics

Optimizing Subspace Expansion in Quantum Chemistry through Operator Selection and Reference State Choice

This paper demonstrates that optimizing Virtual Quantum Subspace Expansion (VQSE) for chemical applications requires a careful co-design of reference state fidelity and operator pool expressivity, showing that while restricted operators make accuracy highly sensitive to reference choice, including specific active-space operators can recover MR-CISD accuracy and achieve chemical precision even on noisy hardware.

Konstantin Lamp, Alejandro D. Somoza, Elias Walter, Marina Walt, Michael Marthaler, Maria Fernanda Juarez, Birger Horstm (…)2026-08-18
⚛️ nuclear theory

Scalable nuclear shell model calculations on noisy quantum computers

This paper demonstrates that the Sample-based Quantum Diagonalization (SQD) framework, when applied to noisy intermediate-scale quantum (NISQ) hardware, can successfully solve large-scale nuclear shell model problems like 32Mg^{32}\text{Mg} that exceed the memory limits of classical high-performance computing, offering a more scalable and time-efficient alternative to traditional variational quantum algorithms.

Durgesh Pandey, Ankit Kumar Das, P. Arumugam2026-08-18
⚛️ quantum physics

The Unidirectional Current as First Arrival-Time POVM: An MS-Kijowski Identity, Physical Interpretation, and Mathematical Applications

This paper establishes an equivalence between detector-based first-arrival models and operator-based arrival-time observables by demonstrating that the normalized unidirectional current of Marchewka and Schuss constitutes a Positive Operator-Valued Measure (POVM) that reproduces Kijowski's arrival-time distribution, thereby unifying the physical interpretations of first-arrival dynamics and directional momentum contributions.

Avi Marchewka2026-08-18
⚛️ lattice

Non-invertible Lattice 1-Form Symmetries for Non-Abelian Topological Order

This paper constructs explicit electric, magnetic, and dyonic 1-form symmetry operators for non-Abelian quantum double lattice models, demonstrating that they form a non-invertible fusion algebra that provides a complete microscopic diagnostic for the topological Hilbert space and characterizes ground states as spontaneously broken non-invertible 1-form symmetry phases.

Rafael Flores-Calderón, Frank Pollmann, Michael Knap2026-08-18
⚛️ quantum physics

Spectral filtering and crystal length as control parameters for conditional correlations in quantum imaging

This paper establishes spectral filtering and crystal length as key control parameters for optimizing conditional momentum and position correlations in SPDC-based quantum imaging, revealing a universal flat-dip-rise profile in position space and demonstrating enhanced resolution capabilities across various crystal types and imaging regimes.

Hashir Kuniyil, Asad Ali, Mohammadreza Rezaee, Saif Al-Kuwari2026-08-18
⚛️ quantum physics

Two-Photon Bound States in the Continuum: A No-Go Theorem and Long-Lived Quasi-Bound States

This paper proves a no-go theorem demonstrating that exact two-photon bound states in the continuum are impossible in a single nonlinear mode coupled to a noninteracting bosonic continuum, while simultaneously showing that long-lived quasi-bound states can be engineered in giant Kerr cavities where the two-photon resonance significantly outlives single-photon excitations.

Yue Chang2026-08-18
⚛️ general relativity

Quantum Permutations and Beyond Quantum Controlled Reference Frames

This paper introduces a generalized framework for quantum reference frames based on "genuinely quantum" permutations (magic unitaries), demonstrating that they enable non-commuting, local superpositions of transformations and extend symmetries in quantum field theories and gravity beyond the capabilities of traditional, classically-controlled reference frames.

Ofek Bengyat, Časlav Brukner, Marios Christodoulou2026-08-18